The **double-dollar** library provides a tiny wrapper for DOM selection that lets you call `forEach` directly on the resulting node list. By exposing a global `$$` (or module export), developers can more succinctly iterate over elements matching a CSS selector (e.g., `$$('.item').forEach(...)`). It’s aimed at front‑end JavaScript developers who want a lightweight, npm‑installable shortcut for element iteration without pulling in larger utility frameworks.